Malicious PDF — malware analysis report

Static analysis result for SHA-256 106a083b8c7161af…

MALICIOUS

PDF

86.3 KB Created: 2021-08-06 22:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e04628754a48ee51d7e3955fa78d51da SHA-1: f1da69f05aa81368a1d1578f87c0e84520274e35 SHA-256: 106a083b8c7161af08c335d63fcf39380012cd3c807c3f09162ba99ca3ae1681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/90949282506.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f415377f---64450861739.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/af953ee484b26ebbb8df8e53f85bf8e1/zinadirupawepiripa.pdfIn PDF document text
    • http://mobiliteit.nu/files/54160648431.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/87958858755.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/26049368233.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a77e526c85cc971c3a2536b094cbf701/44905232075.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160baec9dd692b---vatunazisazu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/9dd6868a13fa457341c1a2691e6a8fbf/tovaripujanibiluxani.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/74071396946.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/35655797741.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ab920d545---jebefobabekez.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083c2278ed40---fozufagogego.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b66b702bf---39960119058.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f824b3b3114---lisozoduraba.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/jedutenifepom.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/16394841906.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d655ab2d44---loxavuzurozaleb.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/bizofeluxodikujiwik.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-24/20210724025359494231.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/91031083846.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160afb645ed795---91820799455.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/favedosoleli.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d290fb3f7047519bec3c9e9c1d92d80/tufib.pdfIn PDF document text
    • http://airsoft1.ro/files/file/dugojevedebeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=are+griffins+on+valgueroPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 10436 bytes
SHA-256: 77d887443e142b32ee16460a422e6575645d09e126aa18eba052bc45dbf7a99b
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 18776 bytes
SHA-256: 568d85542d1ffb1762e3c45fbf3b093f98ff5f1355590149b1391e1da75f3585

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